Screen remains blacks even after waking up from Sleep mode

Hi,
I've had my Macbook Pro for over a year now and it hasn't given me any problems until recently. The screen would remain black when I open up the laptop to wake it up from sleep mode. There would be no response even when I press random keys. When I close the laptop again, the white light at the bottom right corner lights on (when it's supposed to "breathe" while sleeping). The light goes out when I open up the laptop. The only thing I could do is to restart the computer.
What is the problem? Are there any ways to rectify this?

I am going to add my problem to this as I believe it fits and may add to the conversation.
I have a MacBook Pro, am using Parallels, and have an issue waking it up from sleep.
Circumstances:
I close the lid and walk away from the device in my office. When I return, (over night or an hour later) I open the lid, and if nothing happens swipe the touchpad or press a key, the power light changes from pulsating to steady. then in less than 15 seconds it goes back to pusating. The display never energizes, only remain black.
I usually try opening and closing several times, and occaisionally that will work. Other times, I hold the power key until I hear the drive halt, then turn it on. The grey screen will display, then blue, then just before it gets to the log in, the screen goes black (not energized) and the light pulsates.
I have tried the PRAM reset and Safe Mode starts with no luck.
*Now the really wierd thing.* I decieded to contact Apple support on line and pay for help (yes that is weird in an of itself for me). As I began the process it came to the part for me to enter my serial number. With the lid open, I turned the MacBook on its side to try to read the number and the screen energized and the password unlock prompt was waiting for me to enter the password.
Observations
I had read where the light sensor could be blocked by dirt or the light in the room was too dim, but I clean the screen and there is plenty of light. Dales Post is the first that I have seen Parallels and the Sudden Motion Sensor. That makes some sense to me because of what happened when I turned it on its side. I have verified that it happens regardless of using Parallels. as teh last time I did it I had closed out of all my VMs and I believe exited Parallels.
I am going to try the deleting the power preferences file and will report back.

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Screen remains blacks even after waking up from Sleep mode

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